Atmel AVR XMEGA 8/16-bit High Performance Low Power Flas Manuel d'utilisateur télécharger pdf (Page 8)

AVR XMEGA™ MICROCONTOLLERS Everywhere You Are

Clock System

AVR XMEGA’s clock system allow ﬂexible change of frequency. Dynamic Clock Switching allows the Embedded

Designer to tune performance and power consumption to ﬁt the application. The internal PLL and prescaler

can be used to scale the clock sources dynamically up or down to further match application requirements.

With a built-in External Oscillator failure detection and internal RC oscillator with ± 1% accuracy over tempera-

ture and voltage, XMEGA offers the most safe, reliable and ﬂexible clock system.

Interrupt Controller

AVR XMEGA include a multi level interrupt controller. Three priority

levels are supported, where higher level interrupts are prioritized and

executed before low level interrupts. All peripherals can be assigned

any interrupt level.

Automatic

Calibration

Internal

Clock

Sources

External

Clock

Sources

High

Frequency

PLL

Prescaler

Block

Reference

clk

CPU

clk

PER

clk

PER2

clk

PER4

clk

RTC

High-level

Medium-level

Low-level

Program Flow and Interrupt execution

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Main

HOLD

High-level

Medium-level

Program Flow and Interrupt execution

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Main

Medium-level

HOLD

Input and Output

AVR XMEGA offers ﬂexible I/O pin conﬁguration with various sensing,

wake-up, synchronous/asynchronous, and driver settings. I/O pin’s

direction, value and logic state are read through separate registers.

The optional Slew-Rate limitation reduces EMI. Virtual ports regis

ters allow single cycle pin manipulation. This makes software for

bit-banging smaller and faster.

A higher level interrupt will halt execution of a lower level interrupt

routine. The lower level interrupt routine will continue and ﬁnish

after the higher level interrupt routine ﬁnishes.

A second interrupt at an interrupt level already being serviced, will

pend until the ﬁrst interrupt routine ﬁnishes.

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Atmel AVR XMEGA 8/16-bit High Performance Low Power Flas Manuel d'utilisateur Page 8

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